110 APPENDIX. 



Buildings, Holborn, London). Mr. Ross's Educational 

 Microscope is a cheap and good instrument. 



Excellent microscopes are made by Mr. Smith, (Iron- 

 monger Row, St. Luke's), Messrs. Powell & Lealand, 

 (Clarendon Street, Somers Town), and other well- 

 known London opticians. 



Mr. Andrew Pritchard, (162, Fleet Street), who by 

 his various works has greatly promoted the taste for 

 microscopic investigations in this country, has furnished 

 many of my friends with an excellent microscope, of 

 sufficient power for every useful purpose, at the price of 

 from 71 7s. to 127. 12*. 



Mr. Pritchard has published an abstract of Ehren- 

 berg's Classification of Infusoria, with numerous figures, 

 under the name of " A History of Infusoria, living and 

 fossil," 1 vol. 8vo. Whittaker & Co., London, 1845 ; it 

 may be had with the plates either uncoloured or coloured, 

 (price 305.); the latter is well worth the additional 

 price. This work is the best in the English language, 

 for those who desire to follow up this interesting de- 

 partment of natural history. 



There is a cheap French work on the microscope, 

 which will be found an excellent manual; it is entitled 

 " Traite pratique du Microscope, et de son Emploi dans 

 T Etude des Corps organises, par le Docteur L. MANDL ; 

 suivi de Recherches sur V Organisation des Animaux 



